The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 3
... astronomers had calculated the distances of the planets before , but now at last Man had an instrument with which he ... astronomer of the time — indeed , one of the greatest of all time . Johannes Kepler was the first man to ...
... astronomers had calculated the distances of the planets before , but now at last Man had an instrument with which he ... astronomer of the time — indeed , one of the greatest of all time . Johannes Kepler was the first man to ...
Pagina 104
... astronomers , before these measurements were available , had advanced the theory that " dust oceans " hundreds of feet , or even miles , deep might be found on the Moon . This would cer- tainly have been a serious hazard to lunar ...
... astronomers , before these measurements were available , had advanced the theory that " dust oceans " hundreds of feet , or even miles , deep might be found on the Moon . This would cer- tainly have been a serious hazard to lunar ...
Pagina 107
... astronomers until quite recently would have returned an unequivocal “ No , ” pointing out that the lack of air and the temperature extremes ruled out the possibility . Most astronomers would still maintain this position , but a ...
... astronomers until quite recently would have returned an unequivocal “ No , ” pointing out that the lack of air and the temperature extremes ruled out the possibility . Most astronomers would still maintain this position , but a ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless